# frozen_string_literal: true

class RemoveSamlProviderAndIdentitiesNonRootGroup < Gitlab::Database::Migration[2.1]
  BATCH_SIZE = 500

  disable_ddl_transaction!
  restrict_gitlab_migration gitlab_schema: :gitlab_main

  def up
    ::Gitlab::Database
      .allow_cross_joins_across_databases(url: "https://gitlab.com/gitlab-org/gitlab/-/issues/419931") do
      each_batch_range('saml_providers', scope: ->(table) { table.all }, of: BATCH_SIZE) do |min, max|
        execute <<~SQL
          DELETE FROM identities
          WHERE identities.saml_provider_id
          IN
          (
            SELECT saml_providers.id FROM saml_providers
            INNER JOIN namespaces ON namespaces.id=saml_providers.group_id
            AND namespaces.type='Group' AND namespaces.parent_id IS NOT NULL
            AND saml_providers.id BETWEEN #{min} AND #{max}
          );

          DELETE FROM saml_providers
          USING namespaces
          WHERE namespaces.id=saml_providers.group_id
          AND namespaces.type='Group' AND namespaces.parent_id IS NOT NULL
          AND saml_providers.id BETWEEN #{min} AND #{max};
        SQL
      end
    end
  end

  def down
    # noop
  end
end
